Princeton Technology Corp.

Tel: 886-2-29162151

Fax: 886-2-29174598

URL: http://www.princeton.com.tw

Infrared Remote Control Receiver

PT2249A / PT2250A Series

PT2249A/50A v 2.3

Page 5

Revised Dec. 1999

C3 = 0. ) In this way, the PT2249A Series can match the C2, C3 Code Bits

of PT2248 and correctly decode the remote commands.

CODE

T3

T2

T1

K6

PT2248

C3=0

C2=1

C1=1

CODE3

CODE2 OSC

Vcc

PT2249A Series

C3=0

C2=1

Example 1

Circuit Diagram when Code Bit C2 = 1 and C3 = 0

2. Combination of PT2248/PT2250A Series Code Bits

a) PT2250A Series Code Bit C3 is internally pulled high and thereby set at

a default value of “1”. Thus, PT2248 Code Bit C3 must be set at “1”.

b) PT2250A Series Code Bits C2 and C3 may be programmed as follows:

1) “0”, “0” (This combination is not available with TC9150.)

2) “0”, “1”

3) “1”, “0”

4) “1”, “1”

c) To set Code Bit to “1” on PT2248, diodes must be connected to Code

Terminal from the T1 ~ T3 terminals.

d) To set Code Bit to “0” on PT2248, the terminals must be kept floating.